<template>
	<!-- 
	瀑布流纵向 （display: flex） H5 IOS Android支持 
	参考地址:http://www.ruanyifeng.com/blog/2015/07/flex-grammar.html
	-->
	<view class="g-container">
		<view class="g-queue">
			<view class="g-item"></view>
			<view class="g-item"></view>
			<view class="g-item"></view>
			<view class="g-item"></view>
			<view class="g-item"></view>
			<view class="g-item"></view>
			<view class="g-item"></view>
			<view class="g-item"></view>
		</view>
		<view class="g-queue">
			<view class="g-item"></view>
			<view class="g-item"></view>
			<view class="g-item"></view>
			<view class="g-item"></view>
			<view class="g-item"></view>
			<view class="g-item"></view>
			<view class="g-item"></view>
			<view class="g-item"></view>
		</view>
		<view class="g-queue">
			<view class="g-item"></view>
			<view class="g-item"></view>
			<view class="g-item"></view>
			<view class="g-item"></view>
			<view class="g-item"></view>
			<view class="g-item"></view>
			<view class="g-item"></view>
			<view class="g-item"></view>
		</view>
		<view class="g-queue">
			<view class="g-item"></view>
			<view class="g-item"></view>
			<view class="g-item"></view>
			<view class="g-item"></view>
			<view class="g-item"></view>
			<view class="g-item"></view>
			<view class="g-item"></view>
			<view class="g-item"></view>
		</view>
	</view>

</template>

<script>
</script>

<style lang="scss">
	$lineCount: 4;
	$count: 8;

	@function randomNum($max, $min: 0, $u: 1) {
		@return ($min + random($max)) * $u;
	}

	@function randomColor() {
		@return rgb(randomNum(255), randomNum(255), randomNum(255));
	}

	.g-container {
		display: flex;
		flex-direction: row;
		justify-content: space-between;
		overflow: hidden;
	}

	.g-queue {
		display: flex;
		flex-direction: column;
		flex-basis: 24%;

	}

	.g-item {
		position: relative;
		width: 100%;
		margin: 2.5% 0;
	}

	@for $i from 1 to $lineCount+1 {
		.g-queue:nth-child(#{$i}) {
			@for $j from 1 to $count+1 {
				.g-item:nth-child(#{$j}) {
					height: #{randomNum(300, 50)}px;
					background: randomColor();

					&::after {
						content: "#{$j}";
						position: absolute;
						color: #fff;
						font-size: 24px;
						top: 50%;
						left: 50%;
						transform: translate(-50%, -50%);
					}
				}
			}
		}
	}
</style>
